Magazine closure for stapling machines



June 12, 1951 o. A. WAND-EL 2,556,992

MAGAZINE CLOSURE FOR STAPLING MACHINES Filed 0011 9, 1947 4/ 36 0 u i587, 4 a w 0acczrd'i4 zi Z,

Patented June 12 195i UNITED STATES PATENT OFFICE MAGAZINE CLOSURE FOR STAPLING MACHINES Oscar A. Wandel, Chicago, Ill., assignor to Henry A. Torstenson, Chicago, Ill.

Claims.

This invention is concerned with improvements in a portable tacker or fastener driving device which is adapted to drive a U-shaped staple into a surface of wood, cardboard or similar material.

More particularly, the invention is concerned with a fastener driving device of the type which comprises a forward chamber having a vertical fastener guideway therein, a reciprocal driving plunger in the driveway, a bottom horizontally disposed fastener feeding chamber provided with means for delivering fasteners to driving position beneath the plunger and an actuating mechanism for the plunger which is operated by a pivotal rearwardly directed handle member. In this type of device, clogging sometimes occurs in the narrow guideway through which the staples are driven due to one or more of the staples being too large or too small or of incorrect form. To permit the guideway to be cleared when this occurs, a section of the front wall of the guideway is made removable.

It is an object of the invention to provide in a fastener driving device of the type described a removable front wall section and improved mounting means for securing the section in guideway forming position whereby the removable section may be quickly and easily released and replaced.

Another object of the invention is to provide a fastener device of the type described having a removable front wall section in combination with mounting means therefor which permits the section to be readily and easily removed to disconnect the section from the device and which insures rapid and accurate restoring of the section to guideway forming position.

A further object of the invention is to provide in a fastener driving device of the type described an improved bumper block which is arranged beneath the driving plunger to limit the downward movement of the plunger so that the staple will be driven to the proper depth and which is provided with a shock absorbing means for cushioning the movement of the plunger at the end of the driving stroke.

These and other objects and advantages of the invention will be apparent from a description of the preferred form thereof which is shown by way of example in the accompanying drawings, wherein:

Fig. 1 is a perspective view of a fastener driving device embodying the principles of the invention;

Fig. 2 is a side elevation of the device to an enlarged scale with portions thereof broken away;

Fig. 3 is a perspective view of a removable front wall section of the device; and

Fig. 4 is a section on the line 44 of Fig. 2.

The present invention is applicable to various kinds of fastener driving devices such as stapling machines, compression tackers, magazine hammers, etc. For convenience in illustration, the invention is shown embodied in a tacker used for driving U-shaped staples.

A tacker of this type is shown and described in the copending application of Kenneth D. Morberg, Serial No. 717,692, filed December 21, 1946, and issued as U. S. Letters Patent No. 2,456,526, on December 14, 1948, to which reference is made for a detailed description of those features which are not described in detail in this application.

The illustrated form of the tacker comprises a generally U-shaped frame Hi having a forward chamber or driving head I l defined by spaced vertical frame side plates [2 and I3. The forward ends of the side plates l2 and [3 are turned inwardly to provide flanges Mand l5 which form part of the front face of the tacker and the forward side of a guideway for the driving plunger [6 which is mounted for vertical reciprocation in the guideway.

The driving plunger 5 is mounted on a fixed guide post I! and is actuated by a compression spring [8 which surrounds the post i? with its lower end seated in a recess or bore H? in the top of the plunger [6 and with its upper end extending to the cap 20 at the top of the guideway. The plunger It carries a staple driving blade 2| at its bottom end which is secured to its forward face by the rivet 22. The driving plunger is adapted to be elevated to compress the spring l8 and then released for the driving stroke by pivotal operation of a lever or handle 23 and a cooperating trip mechanism 2d within the driving head II.

A bumper block 25 is secured immediately beneath the. driving plunger [6 and is provided with a recess 26 receiving the reduced lower end 21 of the guide post if and a compression spring 28 which surrounds the reduced portion 21 of the post I! and engages in a recess 29 in the lower end of the driving plunger [6 to cushion the shock at the end of the driving stroke. The bumper block 25 is formed by a plurality of plates 30 arranged in face to face relation and secured capable of absorbing without damage the shock produced by the driving operation. The block 25 is positioned on the bottom or bight portion 33 of an inner U-shaped frame having upwardly extending side plates 3d and 35 and is rigidly held in position between the upstanding plates, the securing rivet 3! preferably extending through plates 34 and 35 and also through side plates 12 and I3.

A generally horizontal staple supply chamber 36 is provided beneath the inner frame member 33. The chamber 3% extends reawardly and receives a fastener magazine 37 and a fastener feeding mechanism 38 which feeds fasteners 39 to driving position beneath the fastener driving blade 2!. The fastener magazine 3: is preferably secured to the bottom or bight member 40 of the outer frame lil by screws 4! or the like.

The flanges i4 and I of the side plates 12 and i3 are cut away at the bottom at 42 and 43 and a removable, generally U-shaped front plate member M is provided for positioning thereon with the legs 45 and 45 embracing the lower portion of the side members l2 and E3 of the frame H]. The legs 45 and 56 have upwardly extending top edges and are provided with upwardly opening recesses or slots 4'! and 48 which are aligned transversely thereof. The front plate member 44 is secured in position on the device by means of a pin 49 which extends through a transverse bore 55 provided in the head ll of the tacker. The bore 50 extends through outer side plates 52 and I3, the inner side walls 34 and 35 and the laminated block 25. The ends of the pin 49 project outwardly beyond the faces of the outer side walls 12 and E3. The end of the pin 49 which projects beyond side plate 53 is received in the slot 41 and is provided with a head 5 l. The other end of the pin 49 projects beyond the plate l2 a sufficient distance to accommodate a sliding latching sleeve 52 which is urged inwardly by a compression spring 53 surrounding the pin and seated against an enlarged portion or head 54 on the end of the pin. The pin is received in an enlarged bottom portion 55 of the slot 48 and the sleeve 52 is provided with a reduced portion 56 which is accommodated in the enlarged portion 55. Movement of the sleeve 52 outwardly frees the legs 45 and Q6 of the plate member 44 for removal from engagement with the pin 49. By means of this construction the plate member 44 is very readily removed and replaced.

While specific details of construction have been referred to in illustrating the preferred form of the device, it will be understood that other details may be resorted to within the spirit of the invention.

I claim:

1. In a fastener driving device comprising a frame having a forward chamber provided with a vertical fastener guideway and a fastener driving blade in said guideway, a separable front wall section closing a portion of said guideway, and means on said frame for detachably connecting said front wall section, said connecting means comprising a transverse pin and a laterally movable spring-pressed latching element mounted on said pin.

2. In a fastener driving device comprising a frame having a forward chamber provided with a vertical fastener guideway and a fastener driving blade in said guideway, a removable front wall section for closing a portion of said guideway, said section having rearwardly extending side members adapted to embrace forward side portions of said frame, and means on said frame for detachably securing thereto said rearwardly extending side members, said securing means comprising a transverse pin and a laterally movable spring-pressed latching element mounted on said pin.

3. In a fastener driving device comprising a head having a vertical fastener guideway and a fastener driving blade operable in said guideway, a removable front wall section for said guideway provided with flanges which extend rearwardly in engagement with the side walls of the head, said flanges having upwardly opening slots, a transverse headed pin secured in said head, the ends of said pin being receivable in said slots, and a laterally movable latching sleeve on said pin having a portion engaging in one of the upwardly opening recesses in latching relation to detachably secure said front wall section to said frame.

4. In a fastener driving device comprising a head having a vertical fastener guideway and a fastener driving blade operable in said guideway, a removable front wall section for said guideway provided with flanges which extend rearwardly in engagement with the side walls of the head, said flanges having upwardly opening slots, one of said slots having an enlarged bottom portion, a transverse pin secured in said head with its ends extending beyond the side walls of the head, the extending ends of the pin being receivable in said slots, a sleeve on one end of said pin having a limited axial movement thereon and a reduced portion on said sleeve engaging in latching rela tion in the enlarged portion of said one slot to detachably secure said front wall section to said frame.

5. In a fastener driving device comprising a head having a vertical fastener guideway and a fastener driving blade operable in said guideway, a removable front wall section for said guideway provided with flanges which extend rearwardly in engagement with the side walls of the head, said flanges having upwardly opening slots, a transverse pin secured in said head, said pin having its ends extending laterally of said side walls and receivable in said slots, and a laterally movable. latching sleeve on said pin, said sleeve having means releasably interengaging with one of said rearwardly extending flanges in latching relation to detachably secure said front wall section to said frame.

OSCAR A. WANDEL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PA'IENTS Number Name Date 2,107,169 Weber Feb. 1, 1938 2,309,628 Crosby Feb. 2, 1943 2,310,529 Krantz Feb. 9, 1943 2,408,563 Lang Oct. 1, 1946 2,456,526 Morberg Dec. 14, 1948 

